生活型

herb

形態特徵

• Annual herb; stem ascending to erect, rarely prostrate, glabrous (sometimes, sparsely pubescent on the upper side when young); stipules deltoid, 0.7-0.9 mm long, incised, glabrous or sparsely sericeous inside.
• Leaves often with several small purple spots, chartaceous, oblong-lanceolate to elliptic, 7–30 mm long, 3–12 mm wide, acute to obtuse at apex, oblique at base, serrulate at margin, usually glabrous on both surfaces, sometimes sparsely pilose at base; petioles to 2 mm long, 0.5 mm wide, glabrous.
• Cyathia in cymes with leaf-like bracts; involucres to 0.8 mm long, glabrous outside, pilose inside; stalks to 4 mm long; glands 4, yellowish green, rounded to transversely elliptic, to 0.3 mm long; appendages white and blotched with pink at margin, reniform, entire to subundulate, to 0.7 mm long, 0.5 mm wide; bracteoles linear, in 5 bundles. Male flowers 5–15, anthers red. Female flowers with glabrous pedicel and ovary; style and stigma to 0.5 mm long.
• Capsules trigonal-ovoid, ca. 2.5 mm diam., exserted, nutant, glabrous, the pedicels to 2 mm long; seeds blackish, tetragonal, oblong-ovoid, ca. 1.1 mm long, 0.8 mm diam, transversely rugose.

分布

• 台灣 : It is naturalized in the central and southern parts of Taiwan. Populations of this species occur along railways, tarred roads, wilderness, and recently harvested crop fields.
• 世界 : This species is widely distributed in the New World tropics and subtropics and is an adventive in the Old World.

引證標本

TAICHUNG: Taichung City, Kao 10648. CHIAYI: Chungpu, Lin et al. 282. TAINAN: Shuehchia, Kao 10649. KAOHSIUNG: Hsiaokang, Kao 10510; Hunei, Kao 10469.

參考文獻

• HUANG, TSENG-CHIENG, Flora of Taiwan, second edition 3: 439. .  (Fl. Taiwan 2nd edit.)